Fiber reinforced polypropylene composition
A fiber reinforced, propylene polymer technology, applied in the field of fiber reinforced polypropylene compositions, can solve problems such as reducing stiffness and strength
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preparation example Construction
[0177] For the preparation of the propylene polymer (PP2a) the polymerization process described above for the first propylene polymer (PP1) and the Ziegler-Natta catalyst can be used. Therefore, reference is made to the process and Ziegler-Natta catalyst described above for the first propylene polymer (PP1).
[0178] Propylene polymer (PP2b) measured according to ISO 1133 melt flow rate MFR 2 (230°C, 2.16kg) is preferably 0.1g / 10min to 50.0g / 10min, more preferably 1.0g / 10min to 30.0g / min, even more preferably 10.0g / 10min to 28.0g / 10min.
[0179] Also preferably the propylene polymer (PP2b) has a rather low content of cold xylene solubles (XCS), ie the xylene cold solubles (XCS) is lower than 4.1 wt%. Accordingly, the propylene polymer (PP2b) preferably has a xylene cold soluble (XCS) content of 1.0 wt% to 4.0 wt%, more preferably 1.5 wt% to 3.8 wt%, still more preferably 2.0 wt% to 3.5 wt% %.
[0180]Thus, similarly to the first propylene polymer (PP1) and the propylene pol...
Embodiment approach
[0223] Polypropylene (Pre-PP) is produced in a prepolymerization reactor (PR). Prepolymerization was carried out in the presence of a Ziegler-Natta catalyst (ZN-C2). According to this embodiment, the Ziegler-Natta catalyst (ZN-C2), the cocatalyst (Co) and the external donor (ED) are all introduced into the prepolymerization step. However, this should not exclude the option of adding further co-catalysts (Co) and / or external donors (ED) at a later stage, eg during the polymerization, eg in the first reactor (R1). In one embodiment, the Ziegler-Natta catalyst (ZN-C2), cocatalyst (Co) and external donor (ED) are added only to the prepolymerization reactor (PR) if prepolymerization is performed.
[0224] The prepolymerization reaction is usually carried out at a temperature of 0°C to 60°C (preferably 15°C to 50°C, more preferably 20°C to 45°C).
[0225] The pressure in the prepolymerization reactor is not critical, but must be high enough to keep the reaction mixture in the liqu...
Embodiment approach 1
[0329] Granules comprising a fiber reinforced composition (C) comprising:
[0330] i) an at least bimodal propylene polymer (PP);
[0331] ii) an elastomeric ethylene copolymer (E);
[0332] iii) tackifier (AP); and
[0333] iv) long fiber (LF);
[0334] Wherein, the fiber reinforced composition (C) satisfies inequality (I):
[0335]
[0336] Wherein, w(PP) is based on the total weight of the total weight of the polypropylene composition (C), the weight fraction [wt%] of the propylene polymer (PP), and w(E) is the weight fraction [wt%] of the fiber reinforced composition ( The total weight of C) is based on the weight fraction [wt%] of the elastomeric ethylene copolymer (E).
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Abstract
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